of
,
,
',
'-Tetrabromo-p-xylene at Its Low Concentrations
G. P. Girina, N. M. Alpatovaz, and L. G. Feoktistov
Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russia
Received December 3, 2004
Abstract—In the cyclic voltamograms for electrochemical reduction of 
,,','-tetrabromo-p-xylene at its
concentrations of 5 and 10 mM in dimethylformamide solution of 0.1 M Bu4NBF4, taken at glassy-carbon elec-
trode, four current peaks corresponding to consecutive stages of the reduction process are observed for the first
time. The many times repeated potential cycling from 0 V (SCE) to the value approaching the 2nd peak potential
results in the electrode passivation; a film of the intermediate product of the ,,','-tetrabromo-p-xylene reduction
is deposited at the electrode, whose composition may be –(BrCH–C6H4–CHBr–BrCH–C6H4–CHBr)n–. When the
electrode covered with the deposited film is transferred to a solution of the same composition, in which the pri-
mary cycling was performed, yet free from ,,','-tetrabromo-p-xylene, and underwent to potential
cycling up to –2 V, the first cycle demonstrates a current peak that is due to the film reduction. A redox-active
poly(p-phenylenevinylene) forms at the electrode.
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